Which of the following statements is incorrect?

Q. Which of the following statement is incorrect ?
(a) A person of 'O' blood group has anti 'A' and anti 'B' antibodies in his blood plasma.
(b) A person of 'B' blood group can't donate blood to a person of 'A' group
(c) Blood group is designated on the basis of the presence of antibodies in the blood plasma.

Q. Which of the following statements are incorrect?

Q. A person with 'O' blood group has both antibodies A and B. So consider a situation in which a person with blood group 'O' donates his blood to a person with blood group 'A'. So that antibody A of blood group 'O' should react with antigen A of blood group 'A', so this should lead to coagulation of blood, but this isn't taking place, why?

Q.

A person with type AB blood is considered universal recipient would have ______ antigens on red blood cells, and _______ antibodies in the plasma.

Q. The natural antibodies in the plasma of a person with blood group 'O' is